Ac
Actinium

Actinium is a radioactive chemical element from the periodic table. It is a silvery-white metal that is found in uranium ores. Actinium’s primary use is as a source of alpha particles for research purposes. It is also used in the production of nuclear weapons and nuclear power plants.

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Atomic number89
GroupIIIB
Period7
Mass227
Latin nameActinium
Electron configuration[Rn]6d7s2
Oxidation state0, 2, 3